Firearm and ammunition therefor



March 18', 1924.

R. DEZENDORF- FIREARM AND AMMUNITION THEREFOR 1921 2 SheS-She-et 2 Original Fil'ed'March 18.

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nmlllulllllfll Patented Mar. 1.8, 1924.

UNITEDKS'I'ATES PATENT OFFICE.

RICHARD L. DEZENDORF, OF RICHMOND HILL, NEW YORK.

FIREARM AND AMMUNITIAON THEREFOR.

Application filed March 1 8, 1921, Serial No. 453,334. Renewed J'une 12, 1923.

To all whom t may concern.'

Be it known that I, RICHARD L. DEZEN- DoRF, a citizen of the United States, residing at 9121 112th Street, Richmond Hill, county of Queens, Stateof New York, have invented a certain new and useful Improvement'J in Firearms and Ammunition Therefor, of which the 'following is a full, clear, and exact descriptionz My invention relates to improvements in firearms and ammunition therefor and has for its object to produce a fiashless and noiseless firearm. It further has for its object to produce such a, irearm adapted to either discharge a projectile or to clear obstructionsY from gas service pipes. It further has for its object to -produce a noiseless and ashless, firearm adapted to discharge a projectile and having a single breech.

The .following is a description of an embodiment of my invention, reference being had to the following drawings, in which:

Fig. 1 shows an embodiment of my invention partly in plan andpartly in section;

Fig. 2 shows a side elevation of the cartridge for use in said firearm and embody- 5 1n some features of my invention;

ig. 3 shows a section on the line 3 3, $0 Flig. 1 of the firearm with the cartridge in P ace; Fig. 4 shows partly in plan and partly in section avmodi cation of my firearm;

Fi 5 is a section of the firearm and cartridge en the line 5 5, Fig. xf1;

Fig. 6 is a transverse section on the line 6 6, Fig. 5; and

Fig. A7 shows a section of a service pipe with -the muzzle of the rearm inserted 4.0 therein for use in clearing the service pipe of obstructions. l

Referring more particularly to the drawings, 1 is the barrel of my improvedfrearm, through which the discharge takes place.

2 is a shell surrounding the same, having a tight screw thread connection at 3 and having a spider 4 supporting the rear end of the barrel. The shell 2 is provided with openings 5 for the purpose hereinafter de- 6o scribed. 6 is an extension of the shell 2,

having shell 2 y a screw threaded collar 8 having a shoulder. 9 formed at its rear surface,

erforations 7 and connected to the this construction being adapted to assist in assembly of parts. screw threaded to the shell 2 at 11 Aand to the extension 6 at 12 and forming a chamber 13. 14 is a breech block pivoted to the shell 10 at 15 and providedwith a latch 16 and a firing in 17 which is normally retracted by a spring 18.

Within the extension 6 and shell 2 cartridge composed of a casing 19 into which is screwed an extension 20 so as to form a shoulder 21 adapted to engage the shoulder f). 22 is a screw plug in the rear of the extension 20, forming a, partition` between an explosion chamber 23v and a chamber 24 formed between the rear end of the projectile 25 and the partition 22.4 The walls of 10 is an outer shelh 66 isa' the explosion chamber 23 are provided with openings .26 which are' adapted to register with the -openings 7 in the extension 6. 'I he walls of the chamber formed between the rear end of the projectile 25 and the partition 22 are provided with openings 27`l which open into the chamber 28 at points between the shell' 2 and the barrel 1.

The explosive chamber contains an explosive charge 29 which -is preferably before ignition "confined to the rear end of that chamber by a wad 30. 31 is a fulminate cap in the base .of the cartridge adapted to receive the impact of the firing pin 17 The forward end of the projection 20 enl gages the rear end '-,of the barrel 1 as shown In the operation of this firearm and cartridge, the cartridge is inserted as shown in Fig. 3 and the explosive 29 is ignited by causing the pin 17 to make impact with the fulminate cap 31. This ignites the explosive charge and the gases pass through the openings 7 and 26 into the chamber 13 and then through the openings 5 into chamber 28 and through the openings 27 to the chamber behind the projectile 25. This causes the projectile to be discharged through the barrel 1. On account of the tortuous path through which the gases have to pass in going from the explosive chamber 23 to the chamber 24, the discharge of the gun is ashless and comparatively noiseless. j A

In the modification shown on Sheet 2, the barrel 1 is surrounded by a shell 52 between whose forward end and the barrel a tight connection is made by the packing box 53.Y The casing 52 has an extension 54 secure-d thereto by a screw threaded member 55 which has a shoulder 56. This screw threaded member has a rearwardly projecting tubular wall 57 which is screw threaded to a collar 58, which collar 58 is alsoscrew threaded to the rear of the projection 54, forming a chamber 59 between the member 55 and its projecting wall 57 and the rearward extension 54. 60 is a breech block pivoted to the casing 52 at 61 and provided with a latch 62 and a firing pin 63 normally retractedby a spring G4. 65 is a chamber locatedwithin the .shell 52`surrounding the rear end of the barrel 1. Connecting the chambers 59and 65 is a tortuous passage formed by the p1pes.6 6, 67, 68. Connected to the lower portion of this passage 1s a reservoir 69 provided with aA tight fitting plug 70. The pipes 66, 67 and (58 form a trap which is adapted to contain a liquid 71 supplied from the reservoir 69.

The cartridge employed is similar to the cartridge heretofore described, having a shell 72 'provided with a fulminate cap 73 and having an explosive chamber containing an explosive 74. This shell is provided with perforations 75 which line up With perforations 76 in the wall 57.V Into the forward end of the shell is screwed a tubular extension 7 7 provided with perforations 78 and having in its rear end a plug 7 9 forming a chamber4 between it and the end 0f the projectile 80, this pa1tition79 being located between the perforations 75 and 78. Preferably the explosive charge 74 is confined to the rear portion of the explosive chamber by a wad 81.

In the operation of this gun when the fulminate is discharged the explosive in the explosive chamber'is ignited, the gases passing through the perforations 75 and 76 and the connections 66, 67, and 68 to the chamber which constitutes an expansion chamber. Therefrom the gases pass through the perforation 78 to the chamber behind the projectile 80, forcing the projectile through the barrel. On account of the tortuous connection, the discharge as the projectile leaves the barrel is both noiseless and flashless, the liquid 71 trapped in the connection between the chambers 59 and 65 contributing toward this result. Upon each discharge only a portion of the liquid 7l is'dissipated and thereafter a portion of the liquid from the reservoir 69 goes into the connection so as to praetically restore the original conditions. The plug makes a tight fit and the pressure in the pipe 66 upon the discharge forces part of the liquid 71 back into the reservoir and thus reduces the amount which would be dissipated if the reservoir were not present..

In using my firearm for clearing service pipes a cartridge is made which has no projectile and the forward end of the firearm barrel is insertedjin the header 100 of the service pipe 101, a tight joint being made bythe nipple 102 and the packing box 103. Preferably an extension 104 is screwed to the forward end of the barrel and extended to a point adjacent to the obstruction. Upon the discharge of the firearm the' high pressure gases are thus discharged into the service pipe at a Ipoint adjacent to the obstruction and in most instances will dislodge the obstruction so as to open the service pipe. Either form of firearm can be used for this purpose.

The tortuous passages and chambers forming parts thereof constitute expansion chambers which enable the gases to expand some- .what before they are discharged and assist in securing the comparatively noiseless discharge when the gun is used for discharging projectiles or for service pipe work.

As will be evident to those skilled in the art,my invention permits of various modifications without departing from therspirit thereof ory the scope of the appended claims.

What I- claim is:

1. The combination of a cartridge casing having a chamber for explosive,.a projectile, and a partition between said chamber and projectile and so located as to leave a chamber between it and said projectile, the walls of said chambers being perforated.

' 2.' The combination of a cart-ridge having a chamber for explosive, a projectile, a partition between said chamber and projectile and so located as to leave a chamber between itand said projectile, the walls of said chambers being perforated, and a firearm` having a portion engaging said cartridge between said perforations, and having 'a tortuous passage around sald poition connecting the perforations in said respective walls'.-

3. The combination of a cartrid e having a chamber for explosive, a projectie, a partition between said chamber and projectile and so located as to leave a chamber between it and said projectile, the walls of said chambers being perforated, and a firearm having a portion engaging said cartridge'.

between said perforations, and having a tortuous passage around said portion connecting the perforatlons 1n said respective walls, said cartridge and portion havingshoulders abutting one another.

4. The combination of a cartridge having a chamber for explosivea projectile, a partition between said chamber and projectile and so located as to leave a chamber between los a chamber for explosive, a projectile, a partition between said chamber and projectile and sov located as to leave a chamber between it and said projectile, the Walls of said 5 chambers being perforated, and a flrearm having a. portion engaging said cartridge between said perforations, and having a tor- -sald passage forming a trap adapted to contain a liquid and a supply reservoir connected to said trap.

p RICHARD L. DEZENDORF.-v 

